Experimental determination of dosimetry parameters for Sinko 125I seed source using thermoluminescent dosimeter
10.3760/cma.j.issn.1004-4221.2014.02.022
- VernacularTitle:热释光剂量仪测量体模植入125I粒子源的剂量学参数可行性
- Author:
Menglong ZHANG
;
Shanjun SONG
;
Weipeng WANG
;
Bin ZHAO
- Publication Type:Journal Article
- Keywords:
I-125 seed source;
Thermoluminescent dosimeter;
Phantom;
Dosimetry
- From:
Chinese Journal of Radiation Oncology
2014;23(2):165-168
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the dosimetry parameters of 125I seed source (type Sinko BT-125-1) with thermoluminescent dosimeter (TLD) in the phantom.Methods The new type of phantom was modified to suit to measurement of a common type of 125I seed source.The AAPM TG43 protocol recommended measurements of dose-rate constant (Λ),radial dose function (gL (r)),and anisotropy function (F (r,θ)) have been performed in the phantom with TLD.Results The Λ was 0.928 cGyh-1 U-1.The gL(r) was determined at different radial distances r ranging from 1.0 to 10.0 cm with an interval of 1.0 cm ; and F (r,θ) at angles from 0° to 90° in 10° increments.The gL (r) of 125I seed source showed a difference of 9.6％ at the most in comparison to the corresponding values of 125I seed source (type Amersham 6711).The difference in F(2 cm,θ) of 125I seed source and Amersham 6711 was up to 10.2％ near the source end.With the phantom the combined standard uncertainty in the whole measurement was less than 6.0％.Conclusions The experimental results exhibit fairly small measurement uncertainties and good self-consistency.It's feasible to measure the dosimetry characters of permanent implant seeds in the modified phantom.
